Metai-cutting- machine



R. B. COCHRANE. METAL CUTTING MACHINE. APPLICATION FILED SEPT. I8. I9I5` Patented Nov. 11, 1919.

ATTORNEY R. Bx COCLHRANE. METAL CUTTING MACHINE. APPLICATION FILED SEPT. III. 1915.

1,321,091 Patented Nov. l, 1919.

R. B. COCHBANE. l METAL CUTTING MACHINE.`

P T .1 I pggg o A PLTcA loNTTLTD SEPT 8 1915 Patented NOV' 11,1919.

s SHEETS-SHEET s INIENToR.

` M mur .4 TTORNE YS.

ROBERT l?. OCHRANE, 0F RGCHESTEE, NEWT YORK, SSI-NOR T T. H. SYNGTD O'MPAHY, OF ROCHESTER', NEW YRK, A CORPORATION OF MAXNE.

METAL-CUTTING MACHINE.

learner,

Specicaten of Letters atent.

@aten-ted Nov.. ill.,

Application filed September i8, 1915. Serial No. 51,464..

CuttinOv ll/lfachinesand l do hereb declare b 7 the following to be a full7 clear, and exact description ot the same, reference being had to the accompanying drawings, 'forming a part of this speciication, and to the reference-numerals marked thereon.

The present invention relates to machines Which-are used particularly in the manufacture or' that type of explosive shells or bombs known as sln'apnel5 and it has tor its object to provide a metal cutting,- machine which is adapted especially for the purpose of cutting the annular groove or recess in the base of the shell-case, which is provided to receive the copper band or expansion ring and to provide in the bottom of the recess the waved ridges which assist in securing said band and prevent its rotation on the shell-case due to the frietional Contact of the band with the riding,` ot' the cannon during the longitudinal movement of the shell therein. To these and other endsthe invention consists in certain improvements and combinations of parts, all of which will be hereinafter more fully described, the novel features being pointed out in the claims at the end of the specication.

.In the drawings:

Figure l is aside elevational view showing one embodiment of my present invention;

Fig. 2 is' a `front elevation of the mechanism shown in Fig. l;

Fig. 3 is a top plan view;

Fig. 4 is a horizontal sectional view taken through the supporting bracket for the undercutting' tools lookingin the direction of the base of the machine.

Fig. 5 is a -detail view illustrating the operation of the under-cutting tools, and

Fig. 6 is a detail view showing the operation of the groove cutter' and wave rib cutter. j

Similar reference numerals throughout the several views indicate the same parts.

The machine illustrated herein, it Will be understood, is adapted to be used as one of a series of machines employed in the manufacture of shrapnel shell-cases, the latter being delivered in a state ot' partial completion. So tar as the present machine is conce1-ned, the prior operations consist m turning the shell-case to a specified diameter and length, and for these reasons the structure of the machine consists of few parts, which may be made ot rigid construction, contributing not only to the accuracy of the work7 but also to the speed with which the vvo'rk pieces can be completed.

rl`he grooving tool is mounted on a frame, preferably one having` a short base l carryingthe horizontal spindle 2., provided with a Work piece holder or chuck 3, in front of which arranged a slide or carriage l. having limited transverse movement at the front or' the frame and at the rear side thereotl an upwardly extending bracket' In order to secure the required rigidity o'l the chuck, the latter made with one ot its jaws integral with the spindle which comprises a shaft of larga diameter, permittingl said jaw to be cut or formed in a lip or projection thereon at one side ot' its axis, the other jaw oi the chuck indicated by t3 is journaled on a bolt T as shown in dotted lines in Fig. 3, and is adjusted into opcnand closed position by the nut 8 on the rod 9 lraving an eye surrounding the pin 10 secured in the jaiv 3. The aperture between the jaws 3 and G is bored to receive the work pieces indicated by A, which are all of a given diameter, so that only a slight movement of the aws required to close them in engagement with the Work piece, or to release the latter. rlhe depth of the lchuck is also fixed in order to determine the position of the outer end ol the Work piece or shell-case when the latter is inserted.

The cross slide l guided on horizontal Ways ll on the bed l is reciprocated by the hand wheel 12 on a sha'tt i8 which provided Wit-h a thread l-l cooperating 'with the nut l5 on the bottom of the slide, and the inward movement ot.' the latter is regulated by a screw .stop 16 which cooperates with a projection v17 on the frame. 'lhe slide 'el carries a tool 4 which is positioned to traverse the end oi: the ivork piece A at the forward side of its axis for the purpose oi' making the linal or truingcut on this part of the shell-case and for insuringn accuracy in the length ofthe shell-case, as determined by prior operations performed thereon.

ltltl Also mounted on the slide el is la cutter el which may have one or more projections thereon for grooving the end of the shell, but its primary object is to out toe annular groove in which the copper expansion ring is to be seated, and it is operated preliminarily to the under-cutting of the edges ot` the groove and the formation of the wave ridgesl lat the bottom thereof, and to this end the tool Li" is provided with thespaced cutting points at, which determine the width of said groove and the position of the latter relatively to the base or butt of the shellcase'. The depth. of the groove or grooves is determined by thevadjustment of the stop 1G on the carriage et.

The other tools7 the functions of which have been briefly mentioned above are mounted upon the lbracket 5 and are actuated manually by the operator.` The rib cutter indicated by l8,.is carried upon an arm 19 which curves rearwardly and downe wardly, and is rigidly secured to the shaft 20 which is journaled in the bracket 5. At the rear side of the arm is a projecting finger .21 which cooperates with a -threaded bolt 22 supported on a lug 23 which may be .adjusted tolimit the rocking movementof the arm 19 in one direction to determine the depth of the cut toA be made by the tool 18.

Surrounding the adjustable vstop 22 is an expansible coil spring 2i which serves to normally hold the tool 18 1n a retracted or inoperative position out of engagement with the work piece, and in contact with its actuating cam formed on the shaft 2G journaled on the bracket 5, and oscillated by the lever arm or handle 27, which is rotated forwardly from the position shown in l? ig. l upon the completion of the operation ot' the tool .18. The lever 27 carries a yielding stop in the form of a pin 28 which slides in the lug 29 on the handle against the tension of a coil spring 30 and cooperates with a set screw 31 adjustable in the lugSQ on the bracket The tool 18 being in its normal position, pressure on the lever 27 to move it rearwardly must be sufficient in the first instance to overcome the resistance of the spring 24 and the stop 31 is adjusted. so that when the edge of the tool engages the work piece the operator will feel the increased resistance in the movement of the lever due to the action of the spring 30, which enables him through the sense of feeling to regulate the bite of the tool 18 at. the commencement. of its cutting operation. v

The cutting edge of the tool 18 is formed as shown `in Fig. 6 for the purpose of providing at the bottom of the band groove, two

lor more ribs 18, and in order that these ranged i a projection in the form of a roller 38 which bears against the face of the cam ring 33t carried on the spindle 2, the roller being cause 'l to bear against the face of the cam by means of a spring 35 positioned between the end of the shaft 20 and a bearing block 36 which may be adjusted by the screw 37." .The edges of the band groove are vundercut or dovetailed and two tools 38 and 39 are employed for this purpose and are arto ,be operated simultaneously. These tools are inclined relatively to each other in opposite directions and are guided on a head or block 40 in such a position that one tool is in advance of the other, as shown particularly'in Figs. 1 and 5. The guide block 40 and devices for operating the tools therein are supported upon a slide .41 mounted inrguides extending vertically in the upper end of the bracket 5 for the purpose of permitting these parts to be elevated to give free accessto the work piece and facilitate the application of. the calipers and gages thereto. The position of the guide block or head t0 is determined `by the adjustable set screw 42 and the slide is clamped rigidly on I the bracket by the .bolt 43 carrying the hand nut Vertical movement of the under-cutting tools 3,8 and 39 is accomplished by reciprocation of the stud 45 which carries at its lower end a collar L.t6 resting against the upper ends of said tools and serving to force them into engagement with the work piece and a plate 47 fitting notches in the adjacent edges of the tools for the purpose of retracting them. The stud 45 is guided for vertical movement in a bracket la on the slide 4-.1 and is normally retracted by a spring '428. Journaled on the side of the bracket all is a short shaft 419 having an eccentric pin 49 at one end which enters an aperture in the stud 45 and provided at its opposite extremity with an operating arm or handle 50, the swinging of which inthe direction of the arrow in Fig. l, is suflicient to move the stud 45 downwardly against the tension of the spring L8-until its move ment is arrested by a set screw 51 forming a stop which cooperates with the bracket 41a, which, it will be understood is adjusted to regulate the depth of the cut formed by the tools 38 and 39.

I claim as my invention:

1. A metal cutting machine comprising in combination a frame, a rotatable member mounted thereon adapted to support work piece, av cam faced member carried by the rotatable member, a shaft slidably mounted upon the frame, a roller carried by the shaft,

means for yieldingly holding the shaft in mounted thereon adapted to lsupport a Work oppositely inclined piece, a cam faced member rigidly connected With the rotatable member', a shaft slidably n'iountedupon the frame, a roller carriedby the shaft, means for yieldingly holding the shaft in position to cause the roller 'to engage the Caml faced member, a tool supporting member mounted upon the shaft provided With a cutting tool, means for normally positioning said tool supporting mem.- ber to hold said tool out of engagement with the Work piece, and a lever provided with an actuating cam adapted when operated to engage the tool supporting member for the purpose'of forcing said tool into enga-gement With the Work piece,

3. A metal cutting machine con'iprising in combination a frame, a rotatable member mounted thereon adapted to support af Work piece, a bracket carried the frame, a guideway formed thereima slide adjustably mounted in the guideway', a ltool holding head carried by the slide adapted to receive tools positioned at an angle to the face of the Work piece, a bracket carried by the slide, a stud slidably mountedon the bracket, a collar carried by the stud to engage the tops of said tools for the purpose of forcing the same into engagement With the Work piece, means carried by the stud in engagement with the tools for supporting the sainte, a spring farried by the studiin enmxgement with the last mentioned bracket for normally causing the stud to hold said tools out of engagement Withthe Work piece, and a lever operatively connected with the stud for causing said collar to force thc oppositely inclinedtools into the edges of'agroove formed in the Work piece for the the same.`l

A metal cutting' machine comprising in combination a framel` a rotatable member mounted thereon adapted to support a Work piece, a bracket carried by the frame, a guideway formed therein, a slide adjustably mounted in the guideway, a tool holding head carried by the slide adapted to receive oppositely inclined tools positioned at an angle to the face of the work piece, a. bracket carried by the slide, a stud Slidably mounted in the bracket, means carried bythe stud adapted to support said tools,`

a spring mounted on the last mentioned bracket in engagement with the stud for normally supporting the same in position to hold the tools out of engagement with the work piece, and means'for operating the stud to cause the same to force said tools into engagement with the edges of a groove formed in the work piece.

ROBERT B. COCHRANEK lfVitnesses:

HENRY WV, HALL, l FRANCIS Jnnnoun1 J r.

purpose of under-cutting 

